3  * Atmel SSC driver
14 #include <linux/atmel-ssc.h>
29 	struct ssc_device *ssc;  in ssc_request()  local
32 	list_for_each_entry(ssc, &ssc_list, list) {  in ssc_request()
33 		if (ssc->pdev->dev.of_node) {  in ssc_request()
34 			if (of_alias_get_id(ssc->pdev->dev.of_node, "ssc")  in ssc_request()
36 				ssc->pdev->id = ssc_num;  in ssc_request()
40 		} else if (ssc->pdev->id == ssc_num) {  in ssc_request()
48 		pr_err("ssc: ssc%d platform device is missing\n", ssc_num);  in ssc_request()
52 	if (ssc->user) {  in ssc_request()
54 		dev_dbg(&ssc->pdev->dev, "module busy\n");  in ssc_request()
57 	ssc->user++;  in ssc_request()
60 	clk_prepare(ssc->clk);  in ssc_request()
62 	return ssc;  in ssc_request()
66 void ssc_free(struct ssc_device *ssc)  in ssc_free()  argument
71 	if (ssc->user)  in ssc_free()
72 		ssc->user--;  in ssc_free()
75 		dev_dbg(&ssc->pdev->dev, "device already free\n");  in ssc_free()
80 		clk_unprepare(ssc->clk);  in ssc_free()
117 		.compatible = "atmel,at91rm9200-ssc",
120 		.compatible = "atmel,at91sam9rl-ssc",
123 		.compatible = "atmel,at91sam9g45-ssc",
148 static int ssc_sound_dai_probe(struct ssc_device *ssc)  in ssc_sound_dai_probe()  argument
150 	struct device_node *np = ssc->pdev->dev.of_node;  in ssc_sound_dai_probe()
154 	ssc->sound_dai = false;  in ssc_sound_dai_probe()
159 	id = of_alias_get_id(np, "ssc");  in ssc_sound_dai_probe()
164 	ssc->sound_dai = !ret;  in ssc_sound_dai_probe()
169 static void ssc_sound_dai_remove(struct ssc_device *ssc)  in ssc_sound_dai_remove()  argument
171 	if (!ssc->sound_dai)  in ssc_sound_dai_remove()
174 	atmel_ssc_put_audio(of_alias_get_id(ssc->pdev->dev.of_node, "ssc"));  in ssc_sound_dai_remove()
177 static inline int ssc_sound_dai_probe(struct ssc_device *ssc)  in ssc_sound_dai_probe()  argument
179 	if (of_property_present(ssc->pdev->dev.of_node, "#sound-dai-cells"))  in ssc_sound_dai_probe()
185 static inline void ssc_sound_dai_remove(struct ssc_device *ssc)  in ssc_sound_dai_remove()  argument
193 	struct ssc_device *ssc;  in ssc_probe()  local
196 	ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);  in ssc_probe()
197 	if (!ssc) {  in ssc_probe()
202 	ssc->pdev = pdev;  in ssc_probe()
207 	ssc->pdata = (struct atmel_ssc_platform_data *)plat_dat;  in ssc_probe()
211 		ssc->clk_from_rk_pin =  in ssc_probe()
215 	ssc->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &regs);  in ssc_probe()
216 	if (IS_ERR(ssc->regs))  in ssc_probe()
217 		return PTR_ERR(ssc->regs);  in ssc_probe()
219 	ssc->phybase = regs->start;  in ssc_probe()
221 	ssc->clk = devm_clk_get(&pdev->dev, "pclk");  in ssc_probe()
222 	if (IS_ERR(ssc->clk)) {  in ssc_probe()
228 	clk_prepare_enable(ssc->clk);  in ssc_probe()
229 	ssc_writel(ssc->regs, IDR, -1);  in ssc_probe()
230 	ssc_readl(ssc->regs, SR);  in ssc_probe()
231 	clk_disable_unprepare(ssc->clk);  in ssc_probe()
233 	ssc->irq = platform_get_irq(pdev, 0);  in ssc_probe()
234 	if (ssc->irq < 0) {  in ssc_probe()
236 		return ssc->irq;  in ssc_probe()
240 	list_add_tail(&ssc->list, &ssc_list);  in ssc_probe()
243 	platform_set_drvdata(pdev, ssc);  in ssc_probe()
245 	dev_info(&pdev->dev, "Atmel SSC device at 0x%p (irq %d)\n",  in ssc_probe()
246 			ssc->regs, ssc->irq);  in ssc_probe()
248 	if (ssc_sound_dai_probe(ssc))  in ssc_probe()
249 		dev_err(&pdev->dev, "failed to auto-setup ssc for audio\n");  in ssc_probe()
256 	struct ssc_device *ssc = platform_get_drvdata(pdev);  in ssc_remove()  local
258 	ssc_sound_dai_remove(ssc);  in ssc_remove()
261 	list_del(&ssc->list);  in ssc_remove()
267 		.name		= "ssc",
277 MODULE_DESCRIPTION("SSC driver for Atmel AT91");
279 MODULE_ALIAS("platform:ssc");